Battery Cell Housing Burst Membrane With Integrated Cutting Geometry

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Solution Overview

Problem

Existing rupture membranes made of iron or iron alloys in battery cell casings do not rupture reliably or quickly enough, and integrating them as a single unit with the cell casing is technically and economically challenging.

Innovation Solution

A cell housing with a bursting device comprising an insert element and a bursting membrane, where the insert element has a cutting geometry that structurally weakens the rupture membrane to ensure reliable bursting at a desired pressure, eliminating the need for a separate rupture membrane component and reducing production costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a rupture membrane made of iron or iron alloy is used, then the tensile strength and structural integrity of the cell housing are improved, but the rupture membrane does not rupture reliably or quickly enough at desired pressure

Engineering Contradiction:

Improvetensile strength of rupture membraneVSAvoidreliability of rupture

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

A bursting aid with cutting geometry is integrated into the cell housing to preliminarily prepare a weakness in the rupture membrane before pressure buildup. This cutting geometry creates a stress concentration point that initiates reliable rupture at the desired pressure, solving the problem of iron membranes not rupturing reliably despite their high strength

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The rupture membrane has non-uniform thickness with a thinner region specifically designed to rupture first. This local quality variation creates a predetermined rupture point that overcomes the overall high strength of the iron membrane, allowing controlled pressure relief while maintaining structural integrity in other areas

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If a rupture membrane is integrated as a single unit with the cell casing, then manufacturing complexity and costs are reduced, but integrating iron rupture membrane and iron cell casing as one piece is technically difficult

Engineering Contradiction:

Improvemanufacturing simplicity and costVSAvoidintegration complexity of rupture device

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The bursting aid is integrated directly into the cell housing as a single piece, combining the housing and rupture initiation mechanism into one component. This merging simplifies manufacturing by eliminating separate rupture membrane installation while the bursting aid's cutting geometry ensures reliable rupture function

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The bursting aid acts as an intermediary element between the cell housing and the rupture membrane. It provides the cutting geometry needed to initiate rupture without requiring the rupture membrane itself to be complex or difficult to integrate, thus mediating between the simple integrated housing and the reliable rupture function

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the bursting aid projects beyond the plane of the insert element towards the bursting membrane, then the cutting geometry can effectively weaken the membrane for reliable bursting, but the insert element may interfere with the membrane before pressure buildup

Engineering Contradiction:

Improvereliability of burstingVSAvoidpremature contact or damage to membrane

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The bursting aid is designed to be dynamically positioned relative to the rupture membrane. It projects toward the membrane but only makes contact or effectively acts when the membrane is pushed against it by pressure buildup. This dynamic arrangement ensures the cutting geometry functions only when needed, avoiding premature interference

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution allows for a safe and reliable rupture of the rupture membrane at a controlled pressure, enhancing the stability and tightness of the cell housing while reducing manufacturing complexity and costs.

Implementation Method 1

The insert element has a bursting aid with a cutting geometry associated with the bursting membrane

Methodology Applied

Scientific EffectCutting:

Implementation Method 2

The rupture membrane is designed to burst at a specific pressure inside the cell housing

Methodology Applied

Scientific EffectPressure-induced rupture:

Data Source

PatentEP4648183A1Cell case for battery cell body

Publication Date: 2025.11.12 HOERBIGER ANTRIEBSTECHNIK HOLDING GMBH

Figure 1~2
Figure 3~4

AI summary

A cell housing (10) for a battery cell body (12), comprising side walls (14, 16) and a bursting device (22) arranged on one of the side walls (14, 16). The bursting device (22) is formed from an insert element (24) and a bursting membrane (26). The insert element (24) has a bursting aid (38) with a cutting geometry (40) associated with the bursting membrane (26). The bursting aid (38) projects towards the bursting membrane (26) beyond a plane defined by the insert element (24).